A kind of high-purity instant honey powder and preparation method thereof

Abstract

The present invention provides a high-purity instant honey powder and a preparation method thereof, and the preparation of the high-purity instant honey powder is achieved by adding gliadin and xanthan gum and combining low-temperature plasma sterilization technology and spray drying. The gliadin and xanthan gum added in the present invention can both reduce the degree of binding between honey and water and reduce the water absorption; the gliadin and xanthan gum form a gel network structure, and the honey powder after spray drying is more dispersible and not easy to agglomerate, thereby improving the instant solubility of the honey powder; at the same time, the sucrose in the honey is hydrogen-bonded with the gliadin, the glass transition temperature is increased, and the water content is reduced, so that the honey powder is not easy to absorb moisture and agglomerate, and has a wider market applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of bee product processing, and particularly relates to high-purity instant honey powder and a preparation method thereof. Background Art

[0002] Honey is a natural, green, healthy and nutritious food. It contains more than 180 different substances. The main ingredients are sugars, including glucose, fructose, sucrose and maltose. Other ingredients include various amino acids, vitamins, minerals, enzymes, aromatic substances, pigments, organic acids, enzymes, antioxidants and biologically active substances.

[0003] my country is a major honey producer, and honey is mostly sold in the form of fluid or semi-fluid both at home and abroad. However, honey is a high-viscosity fluid with a water content of about 20% and contains sugar-tolerant yeast. It is easy to ferment and deteriorate. The acidic components in it can also react with metal containers to cause corrosion. In addition, honey is easy to crystallize under normal storage conditions. These have brought many inconveniences to the transportation, storage and use of honey. In recent years, solid honey has been welcomed by domestic and foreign markets and consumers. At present, solid honey can be divided into two types: (1) solid honey blocks or slices; (2) solid honey powder. Solid honey powder has good fluidity and is easy to mix evenly with other powdered food ingredients. It can be used in solid beverages such as coffee or as a sweetener in baked goods. It not only maintains the nutrients and unique flavor of liquid honey, but is also convenient to use, eat and transport. The product can be stored for a long time. Therefore, honey powder has great market potential. It is very meaningful to process liquid honey into honey powder that is easy to disperse and mix well, and can maintain the original flavor and nutrition of honey through a certain processing technology.

[0004] More than 70% of honey is glucose and fructose. Fructose is more hygroscopic than glucose. This is because although it has the same number of hydroxyl groups as glucose, the latter's hydrogen bonding sites have formed sugar-sugar hydrogen bonds, so honey itself is easy to absorb moisture. Therefore, the existing technology has the problems of easy agglomeration, poor dissolution, easy water absorption, agglomeration, or insolubility of solid honey powder, which affects the effectiveness of honey and has room for production improvement. Therefore, it is necessary to prepare a high-purity instant honey powder.

[0005] Cold sterilization of food is the development direction of international food science and technology. Cold plasma sterilization (CPCS) uses the medium around food to generate photoelectrons, ions and active free radicals to contact the surface of microorganisms to cause cell destruction and achieve the purpose of sterilization. In order to improve food safety and extend shelf life, the widespread application of cold sterilization technology has become an inevitable trend in the development of the food industry. Summary of the invention

[0006] Technical problem to be solved: In view of the above technical problems, the purpose of the present invention is to provide a high-purity instant honey powder and a preparation method thereof, by adding gliadin and xanthan gum to reduce the degree of binding between honey and water, thereby reducing the water absorption; at the same time, gliadin and xanthan gum form a gel network structure, so that the honey powder after spray drying is more dispersible and not easy to agglomerate, thereby further improving the solubility of the honey powder; in addition, the sucrose in the honey is hydrogen-bonded to gliadin, the glass transition temperature is increased, the water content is reduced, and the honey powder can also achieve the effect of not being easy to absorb moisture and agglomerate.

[0007] Technical solution: A method for preparing high-purity instant honey powder, comprising the following steps:

[0008] S1. Weigh 2-3 parts of gliadin and dissolve them in 15-20 parts of 70-80% ethanol solution, and evaporate them at 40-50°C for 0.5-2h;

[0009] S2. Dissolve 3-5 parts of xanthan gum in 10-15 parts of distilled water, stir well, and mix with the above solution to obtain a mixed solution;

[0010] S3. Add honey to the mixed solution, add water to adjust the honey content to 70-80%, homogenize, and sterilize and preserve using low-temperature plasma cold sterilization technology;

[0011] S4. Ultrasonic treatment, spray drying, cooling, crushing and packaging to obtain high-purity instant honey powder.

[0012] Furthermore, in step S2, the stirring speed is 500-1000 rpm, and the stirring time is 10-60 min.

[0013] Furthermore, in step S3, the volume ratio of the mixed solution to honey is 1:(3-4).

[0014] Furthermore, in step S3, the homogenization pressure is 10-35 MPa, and the homogenization time is 2-15 min.

[0015] Furthermore, the parameters of the low-temperature plasma cold sterilization technology in step S3 are: AC100-240KV, frequency 70-200Hz, and modulation frequency 7-20Hz.

[0016] Further, the frequency of the ultrasonic treatment in step S4 is 10-35KHz, the power is 100-1000W, and the time is 30-60min. Further, the spray drying in step S4 is specifically: the flow rate is controlled by a constant flow pump to be 10-30mL / min for spray drying, the inlet air temperature is 150-220°C, the outlet air temperature is 60-90°C, and the atomizer speed is 18000-22000r / min.

[0017] Furthermore, in step S4, the crushing particle size is 0.05-0.30 mm.

[0018] Beneficial effects:

[0019] 1. The addition of gliadin in the present invention affects the state of water in honey and reduces the water absorption; the protein preferentially migrates to the droplet-air interface and then quickly forms a film when in contact with dry air. The amorphous film overcomes the viscosity by increasing the glass transition temperature of the honey surface, which is more conducive to complete drying; in addition, the addition of xanthan gum also reduces the active polar center of honey, significantly reduces the degree of combination of honey and water, reduces the hygroscopicity of honey powder, and avoids the occurrence of hygroscopic agglomeration;

[0020] 2. In the present invention, gliadin and xanthan gum form a gel network structure, and the honey powder after spray drying is more dispersible and not easy to agglomerate. In addition, the particle size of the honey powder obtained by spraying is smaller, which is beneficial to improving the instant solubility of the honey powder;

[0021] 3. The sucrose and gliadin in the honey of the present invention are hydrogen bonded, the glass transition temperature is increased, and the water content is reduced, so that the honey powder is not easy to absorb moisture and agglomerate, and is more stable during storage, thereby extending the shelf life;

[0022] 4. In the present invention, the hygroscopicity and instant solubility of honey powder are improved by adding gliadin and xanthan gum, thereby avoiding the addition of a large amount of auxiliary materials such as maltodextrin, β-cyclodextrin, soluble starch, etc., which would make the flavor of honey less prominent if the proportion of ingredients added is large. In the present invention, only a small amount of gliadin and xanthan gum is added to obtain honey powder with a high honey content;

[0023] 5. The present invention adopts low-temperature plasma cold sterilization technology, which can reduce the loss of reducing sugar content in honey powder and ensure the activity of amylase, thereby improving the nutrition and quality of honey powder. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with embodiments, which are explanations of the present invention and are not limited to the following embodiments:

[0025] Example 1

[0026] A method for preparing high-purity instant honey powder comprises the following steps:

[0027] 1. Weigh 2 kg of gliadin and dissolve it in 20 L of 70% ethanol solution. Rotary evaporate at 40 °C for 2 h.

[0028] 2. Dissolve 3 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC100 KV, the frequency is 70 Hz, and the modulation frequency is 7 Hz;

[0029] 4. Under the conditions of frequency of 15KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0030] Example 2

[0031] A method for preparing high-purity instant honey powder comprises the following steps:

[0032] 1. Weigh 2.5 kg of gliadin and dissolve it in 20 L of 70% ethanol solution. Rotary evaporate at 40 °C for 2 h.

[0033] 2. Dissolve 3 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC120 KV, the frequency is 80 Hz, and the modulation frequency is 8 Hz;

[0034] 4. Under the conditions of frequency of 15KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0035] Example 3

[0036] A method for preparing high-purity instant honey powder comprises the following steps:

[0037] 1. Weigh 3 kg of gliadin and dissolve it in 20 L of 70% ethanol solution, and evaporate it at 40 ° C for 2 h;

[0038] 2. Dissolve 3 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC140KV, the frequency is 90 Hz, and the modulation frequency is 9 Hz;

[0039] 4. Under the conditions of frequency of 15KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0040] Example 4

[0041] A method for preparing high-purity instant honey powder comprises the following steps:

[0042] 1. Weigh 2 kg of gliadin and dissolve it in 20 L of 70% ethanol solution. Rotary evaporate at 40 °C for 2 h.

[0043] 2. Dissolve 4 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC160 KV, the frequency is 100 Hz, and the modulation frequency is 10 Hz;

[0044] 4. Under the conditions of frequency of 15KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0045] Example 5

[0046] A method for preparing high-purity instant honey powder comprises the following steps:

[0047] 1. Weigh 2 kg of gliadin and dissolve it in 20 L of 70% ethanol solution. Rotary evaporate at 40 °C for 2 h.

[0048] 2. Dissolve 5 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC180 KV, the frequency is 110 Hz, and the modulation frequency is 11 Hz;

[0049] 4. Under the conditions of frequency of 15KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0050] Example 6

[0051] A method for preparing high-purity instant honey powder comprises the following steps:

[0052] 1. Weigh 2 kg of gliadin and dissolve it in 15 L of 70% ethanol solution. Rotary evaporate at 40 °C for 2 h.

[0053] 2. Dissolve 3 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 60 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 70%, homogenize at a pressure of 20 MPa for 5 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC200KV, the frequency is 120 Hz, and the modulation frequency is 12 Hz;

[0054] 4. Under the conditions of frequency of 15KHz and power of 100W, ultrasonic treatment was performed for 60min, and the flow rate was controlled at 10mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 80°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0055] Example 7

[0056] A method for preparing high-purity instant honey powder comprises the following steps:

[0057] 1. Weigh 3 kg of gliadin and dissolve it in 15 L of 80% ethanol solution. Rotary evaporate at 50 °C for 0.5 h.

[0058] 2. Dissolve 5 kg of xanthan gum in 15 L of distilled water, stir at 800 rpm for 30 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 80%, homogenize at a pressure of 25 MPa for 2 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC220KV, the frequency is 130 Hz, and the modulation frequency is 13 Hz;

[0059] 4. Under the conditions of frequency of 16KHz and power of 200W, ultrasonic treatment was performed for 55min, and the flow rate was controlled at 30mL / min by a constant flow pump for spray drying. The inlet air temperature was 210°C, the outlet air temperature was 90°C, the atomizer speed was 21000r / min, and the mixture was cooled, crushed and packaged to obtain high-purity instant honey powder.

[0060] Example 8

[0061] A method for preparing high-purity instant honey powder comprises the following steps:

[0062] 1. Weigh 2 kg of gliadin and dissolve it in 15 L of 72% ethanol solution. Rotary evaporate at 40 °C for 1.5 h.

[0063] 2. Dissolve 4 kg of xanthan gum in 10 L of distilled water, stir at 600 rpm for 50 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 72%, homogenize at a pressure of 21 MPa for 3 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC240KV, the frequency is 140 Hz, and the modulation frequency is 14 Hz;

[0064] 4. Under the conditions of frequency of 18KHz and power of 300W, ultrasonic treatment was performed for 50min, and the flow rate was controlled at 14mL / min by a constant flow pump for spray drying. The inlet air temperature was 200℃, the outlet air temperature was 80℃, the atomizer speed was 20050r / min, and the mixture was cooled, crushed and packaged to obtain high-purity instant honey powder.

[0065] Example 9

[0066] A method for preparing high-purity instant honey powder comprises the following steps:

[0067] 1. Weigh 3 kg of gliadin and dissolve it in 17 L of 74% ethanol solution. Rotary evaporate at 42 °C for 1.8 h.

[0068] 2. Dissolve 4 kg of xanthan gum in 10 L of distilled water, stir at 700 rpm for 45 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 74%, homogenize at a pressure of 22 MPa for 3 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC150 KV, the frequency is 150 Hz, and the modulation frequency is 15 Hz;

[0069] 4. Under the conditions of frequency of 20KHz and power of 400W, ultrasonic treatment was performed for 45min, and the flow rate was controlled at 18mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 84°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0070] Example 10

[0071] A method for preparing high-purity instant honey powder comprises the following steps:

[0072] 1. Weigh 2 kg of gliadin and dissolve it in 18 L of 74% ethanol solution. Rotary evaporate at 46 °C for 1.4 h.

[0073] 2. Dissolve 5 kg of xanthan gum in 12 L of distilled water, stir at 800 rpm for 35 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 76%, homogenize at a pressure of 23 MPa for 4 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC170 KV, the frequency is 160 Hz, and the modulation frequency is 16 Hz;

[0074] 4. Under the conditions of frequency of 22KHz and power of 500W, ultrasonic treatment was performed for 40min, and the flow rate was controlled at 20mL / min by a constant flow pump for spray drying. The inlet air temperature was 200℃, the outlet air temperature was 85℃, and the atomizer speed was 21000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0075] Embodiment 11

[0076] A method for preparing high-purity instant honey powder comprises the following steps:

[0077] 1. Weigh 3 kg of gliadin and dissolve it in 20 L of 78% ethanol solution. Rotary evaporate at 48 °C for 1.2 h.

[0078] 2. Dissolve 3 kg of xanthan gum in 12 L of distilled water, stir at 600 rpm for 55 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 78%, homogenize at a pressure of 24 MPa for 4 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC210KV, the frequency is 170 Hz, and the modulation frequency is 17 Hz;

[0079] 4. Under the conditions of frequency of 24KHz and power of 600W, ultrasonic treatment was carried out for 35min, and the flow rate was controlled at 22mL / min by a constant flow pump for spray drying. The inlet air temperature was 200℃, the outlet air temperature was 86℃, the atomizer speed was 20060r / min, and the mixture was cooled, crushed and packaged to obtain high-purity instant honey powder.

[0080] Example 12

[0081] A method for preparing high-purity instant honey powder comprises the following steps:

[0082] 1. Weigh 2 kg of gliadin and dissolve it in 20 L of 80% ethanol solution. Rotary evaporate at 50 °C for 0.6 h.

[0083] 2. Dissolve 5 kg of xanthan gum in 13 L of distilled water, stir at 700 rpm for 50 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 80%, homogenize at a pressure of 25 MPa for 3 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC200 KV, the frequency is 180 Hz, and the modulation frequency is 18 Hz;

[0084] 4. Under the conditions of frequency of 25KHz and power of 800W, ultrasonic treatment was carried out for 32 minutes, and the flow rate was controlled at 24mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 88°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0085] Embodiment 13

[0086] A method for preparing high-purity instant honey powder comprises the following steps:

[0087] 1. Weigh 3 kg of gliadin and dissolve it in 20 L of 80% ethanol solution. Rotary evaporate at 50 °C for 0.7 h.

[0088] 2. Dissolve 5 kg of xanthan gum in 14 L of distilled water, stir at 800 rpm for 35 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:3, add water to adjust the honey content to 80%, homogenize at a pressure of 25 MPa for 2 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC230KV, the frequency is 200 Hz, and the modulation frequency is 20 Hz;

[0089] 4. Under the conditions of frequency of 25KHz and power of 1000W, ultrasonic treatment was carried out for 30min, and the flow rate was controlled at 28mL / min by a constant flow pump for spray drying. The inlet air temperature was 210℃, the outlet air temperature was 90℃, and the atomizer speed was 21000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0090] Comparative Example 1

[0091] The difference between this comparative example and Example 9 is that no xanthan gum is added, and the details are as follows:

[0092] A method for preparing high-purity instant honey powder comprises the following steps:

[0093] 1. Weigh 7 kg of gliadin and dissolve it in 27 L of 74% ethanol solution. Rotary evaporate for 1.8 h at 42 °C to obtain a mixed solution.

[0094] 2. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 74%, homogenize at a pressure of 22Mpa for 3 minutes, and use low-temperature plasma technology to sterilize and preserve the mixture, with a voltage of AC150KV, a frequency of 150Hz, and a modulation frequency of 15Hz;

[0095] 3. Under the conditions of frequency of 20KHz and power of 400W, ultrasonic treatment was performed for 45min, and the flow rate was controlled at 18mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 84°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0096] Comparative Example 2

[0097] The difference between this comparative example and Example 9 is that no gliadin is added, specifically as follows:

[0098] A method for preparing high-purity instant honey powder comprises the following steps:

[0099] 1. Dissolve 7 kg of xanthan gum in 27 L of distilled water and stir at 700 rpm for 45 min to obtain a mixed solution;

[0100] 2. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 74%, homogenize at a pressure of 22Mpa for 3 minutes, and use low-temperature plasma technology to sterilize and preserve the mixture, with a voltage of AC150KV, a frequency of 150Hz, and a modulation frequency of 15Hz;

[0101] 3. Under the conditions of frequency of 20KHz and power of 400W, ultrasonic treatment was performed for 45min, and the flow rate was controlled at 18mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 84°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0102] Comparative Example 3

[0103] The difference between this comparative example and Example 9 is that high temperature sterilization is adopted, which is as follows:

[0104] A method for preparing high-purity instant honey powder comprises the following steps:

[0105] 1. Weigh 3 kg of gliadin and dissolve it in 17 L of 74% ethanol solution. Rotary evaporate at 42 °C for 1.8 h.

[0106] 2. Dissolve 4 kg of xanthan gum in 10 L of distilled water, stir at 700 rpm for 45 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 74%, homogenize at a pressure of 22 MPa for 3 min, and sterilize at 80°C for 15 min;

[0107] 4. Under the conditions of frequency of 20KHz and power of 400W, ultrasonic treatment was performed for 45min, and the flow rate was controlled at 18mL / min by a constant flow pump for spray drying. The inlet air temperature was 190°C, the outlet air temperature was 84°C, and the atomizer speed was 20000r / min. After cooling, crushing and packaging, high-purity instant honey powder was obtained.

[0108] Comparative Example 4

[0109] The difference between this comparative example and Example 9 is that freeze drying is adopted, as follows:

[0110] A method for preparing high-purity instant honey powder comprises the following steps:

[0111] 1. Weigh 3 kg of gliadin and dissolve it in 17 L of 74% ethanol solution. Rotary evaporate at 42 °C for 1.8 h.

[0112] 2. Dissolve 4 kg of xanthan gum in 10 L of distilled water, stir at 700 rpm for 45 min, and mix with the above solution to obtain a mixed solution; 3. Add honey to the mixed solution, the volume ratio of the mixed solution to honey is 1:4, add water to adjust the honey content to 74%, homogenize at a pressure of 22 MPa for 3 min, and use low-temperature plasma technology for disinfection and preservation, the voltage is AC150 KV, the frequency is 150 Hz, and the modulation frequency is 15 Hz;

[0113] 4. Under the conditions of frequency of 20KHz and power of 400W, ultrasonic treatment is carried out for 45 minutes, freeze-drying, crushing and packaging to obtain high-purity instant honey powder.

[0114] Performance Test:

[0115] (1) Yield, water content and moisture absorption rate

[0116] Yield: Weigh the mass of the product before spray drying and the mass of the product after drying. The ratio of the latter to the former is the yield.

[0117] Water content: Take 2-5g of honey powder, make three parallel pieces, and spread them flat in flat bottles that have been dried to constant weight, with a thickness of no more than 5mm and a loose sample of no more than 10mm. Open the bottle cap and dry at 100-150℃ for 5h, cover the bottle cap, move it to a dryer, cool for 30min, accurately weigh it, and then dry it at the above temperature for 1h, cool, and weigh it until the difference between two consecutive weighings does not exceed 5mg. Calculate the water content in the sample based on the lost weight.

[0118] Moisture absorption rate: Place the honey powder sample in a constant-weight weighing bottle, weigh it accurately, and then place it in a glass desiccator. Open the weighing bottle cap and measure the moisture absorption rate under RH57.70%. Place the desiccator in a constant-temperature incubator and observe at 25±5℃. After 24 hours, weigh the sample accurately. The moisture absorption rate formula is as follows:

[0119] Moisture absorption rate = [(powder weight after moisture absorption - powder weight before moisture absorption) / powder weight before moisture absorption] × 100%

[0120] Table 1 Yield, water content and moisture absorption rate of each embodiment and comparative example

[0121]

[0122]

[0123] As can be seen from Table 1, the yield of honey powder prepared in Examples 1-13 is 27.8-29.4%, and there is no significant difference in the yield of honey powder in Comparative Examples 1-4; the water content of honey powder prepared in Examples is 1.1-1.7%, and the water content of honey powder prepared in Comparative Example 1 without adding xanthan gum and Comparative Example 2 without adding gliadin is significantly higher than that in Examples, which shows that the addition of gliadin and xanthan gum can reduce the water content of honey powder; the honey powder prepared by high temperature sterilization in Comparative Example 3 and freeze-drying technology in Comparative Example 4 has a significantly higher moisture absorption rate and is easier to agglomerate. It can be seen that the addition of gliadin and xanthan gum significantly reduces the degree of combination of honey and water, reduces the hygroscopicity of honey powder, and avoids the occurrence of moisture absorption and agglomeration.

[0124] (2) Particle size and solubility

[0125] Particle size: The particle size of the honey powder prepared in each embodiment and comparative example was measured using a laser particle size analyzer.

[0126] Instant solubility: Dissolve 5g of honey powder in 45g (80℃) distilled water, start the stirrer at low speed, and record the complete dissolution time (s) of the honey powder. Generally speaking, the complete dissolution time is within 5s, which is instant.

[0127] Table 2 Particle size and instant dissolution time of each embodiment and comparative example

[0128]

[0129]

[0130] As can be seen from Table 2, the honey powder prepared in the embodiment of the present invention has a particle size of 0.14-0.20 mm and a quick dissolution time of 3-5 s. Because gliadin and xanthan gum can form a gel network structure, the honey powder after spray drying is more dispersible and not easy to agglomerate, and the honey powder obtained by spraying has a smaller particle size, which is beneficial to improving the quick solubility of the honey powder; while Comparative Examples 1 and 2 only add gliadin and xanthan gum, respectively, and cannot form a network structure, so that the particle size of the honey powder is slightly larger and the dissolution time is relatively long; Comparative Example 3 uses high-temperature sterilization to prepare honey powder. Although it can effectively kill microorganisms in honey, the high temperature required for thermal sterilization will cause changes and losses in color, flavor and nutrients of the food, and the particle size is larger than that of the embodiment; Comparative Example 4 uses freeze-drying to prepare honey powder. Since the honey liquid is relatively viscous, the diffusion resistance of the sublimated gas is extremely large, and drying is more difficult, the particle size of the prepared honey powder is relatively large, and therefore the quick dissolution time is correspondingly affected.

[0131] (3) Reducing sugar and amylase values

[0132] Table 3 Reducing sugar and amylase values ​​of various examples and comparative examples

[0133]

[0134]

[0135] Reducing sugar is an important indicator for measuring the nutritional components of honey. As shown in Table 3, the reducing sugar content of the honey prepared in Comparative Example 3 is significantly lower than that of the honey prepared in Example 3. This is mainly because the reducing sugar is consumed by carbonyl-amine reaction with amino acids in honey under heating conditions. Comparative Example 3 adopts high temperature sterilization, so the reducing sugar content varies greatly.

[0136] Amylase is the main biological enzyme in honey. The higher the amylase value, the greater the maturity of the honey. Generally, the amylase value standard for honey exported from my country is not less than 8.3. As can be seen from Table 3, the amylase value of Comparative Example 3 is 20.5, which is significantly lower than the amylase value of the honey powder prepared in the embodiment and other comparative examples. It can be seen that high-temperature sterilization will reduce the activity of amylase. Therefore, the present invention adopts low-temperature plasma cold sterilization technology, which is more conducive to ensuring the amylase activity in honey and improving the quality of honey powder.

[0137] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the above disclosed methods and technical contents without departing from the spirit and technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing high-purity instant honey powder, characterized in that: The following steps are involved: S1. Weigh 2-3 parts of gliadin and dissolve them in 15-20 parts of 70-80% ethanol solution, and evaporate them at 40-50°C for 0.5-2h; S2. Dissolve 3-5 parts of xanthan gum in 10-15 parts of distilled water, stir well, and mix with the above solution to obtain a mixed solution; S3. Add honey to the mixed solution, add water to adjust the honey content to 70-80%, homogenize, and disinfect using low-temperature plasma; the volume ratio of the mixed solution to honey in step S3 is 1: (3-4); S4. Ultrasonic treatment, spray drying, cooling, crushing and packaging to obtain high-purity instant honey powder.

2. The method for preparing a high-purity instant honey powder according to claim 1, wherein: In step S2, the stirring speed is 500-1000 rpm, and the stirring time is 10-60 min.

3. The method for preparing a high-purity instant honey powder according to claim 1, wherein: In step S3, the homogenization pressure is 10-35 MPa, and the homogenization time is 2-15 min.

4. The method for preparing a high-purity instant honey powder according to claim 1, wherein: The technical parameters of low-temperature plasma sterilization in step S3 are: voltage is AC100-240KV, frequency is 70-200Hz, and modulation frequency is 7-20Hz.

5. The method for preparing a high-purity instant honey powder according to claim 1, characterized in that: The frequency of the ultrasonic treatment in step S4 is 10-35 KHz, the power is 100-1000 W, and the time is 30-60 min.

6. The method for preparing a high-purity instant honey powder according to claim 1, characterized in that: The spray drying in step S4 is specifically as follows: spray drying is performed with a flow rate of 10-30 mL / min controlled by a constant flow pump, an air inlet temperature of 150-220° C., an air outlet temperature of 60-90° C., and an atomizer speed of 18000-22000 r / min.

7. The method for preparing a high-purity instant honey powder according to claim 1, characterized in that: The crushing particle size in step S4 is 0.05-0.30 mm.

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